1. I've done a few plan views for some of the components but I generally don't produce plan view drawings anyway, so I don't expect to make an accompanying plan view for each elevation view.

2. You could try drawing plan views for the various components if you want, or try drawing new components where necessary. Areas I haven't really covered (off the top of my head) are the auxiliaries, PT boats, the submarines, amphibs, and aircraft carriers. All of those units have unique components that don't generally apply to the battleship-cruiser-destroyer subset I normally focus on.

And of course, finding high-res photos or original yard plans of anything USN-related from the time period is always appreciated.